Publication of Final Terms

SOUTH EASTERN POWER NETWORKS PLC

GBP 10,000,000,000 EURO MEDIUM TERM NOTE PROGRAMME

PUBLICATION OF FINAL TERMS: SERIES 2021-1

The following final terms (the "Final Terms") are available for viewing:

Final Terms dated 28 September 2021 in relation to the GBP 300,000,000 Fixed Rate Notes due 2034 (ISIN XS2389042263) (the "Notes"), Series 2021-1, issued by South Eastern Power Networks plc (the "Issuer") under the GBP 10,000,000,000 Euro Medium Term Note Programme (the "Programme") of the Issuer, Eastern Power Networks plc and London Power Networks plc.

To view the Final Terms, please paste into the address bar of your browser or click on the following URL:

http://www.rns-pdf.londonstockexchange.com/rns/6177N_1-2021-9-30.pdf

A copy of the Final Terms has also been submitted to the National Storage Mechanism and will shortly be made available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism .

For further information, please contact:

Andrew KluthHead of Treasury, UK Power Networks4th Floor Newington House237 Southwark Bridge RoadLondon, SE1 6NP

Tel: 020 7397 7716

DISCLAIMER - INTENDED ADDRESSEES

Manufacturer target market (UK MiFIR product governance) is eligible counterparties and professional clients only (all distribution channels).

The Final Terms complete the Offering Circular dated 22 July 2021 (the "Offering Circular") with regard to the terms of the Notes. Please note that the information contained in the Offering Circular as completed by the Final Terms may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Offering Circular) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the information contained in the Offering Circular is not addressed. Prior to relying on the information contained in the Offering Circular you must ascertain from the Offering Circular whether or not you are part of the intended addressees of the information contained therein.

Your right to access this service is conditional upon complying with the above requirement.

Neither this announcement nor the publication of the Final Terms constitutes an offer of the Notes described in the Offering Circular for sale in the United States. This is not for distribution in the United States. The Notes have not been, and will not be, registered under the United States Securities Act of 1933, as amended (the "Securities Act") and are subject to U.S. tax law requirements. Subject to certain exceptions, Notes may not be offered, sold or delivered, directly or indirectly, in the United States or to, or for the account or benefit of U.S. persons, as such terms are defined in Regulation S under the Securities Act. There will be no public offering of the Notes in the United States.